I have three 300 fireball whatever you want to call them. p320 and I have both posted loads over the years. I'm sold on 1680 and have a subsonic load I use in my AR that cycles without me having to change springs or move the gas port. I've run 1000's of them through my Cyclone. I for one am glad that someone is making a standard and putting it out there for people to use. I'm going to change all of my guns to that standard and call it good. I can't wait to try some. As far as the crimped primers I've used lake city 5.56 brass for so many years making my 300w brass I'm used to running brass through my dillon the first time around. It's all good ..